[Paraview] PV 3.12.0 coprocessing problem

[Biddiscombe, John A.]

I'm getting lock ups when saving images using the coprocessing. It looks a lot like a bug that was fixed many moons ago, but maybe the fix got lost in a merge ... 

1  process makes it to here and waits for MPI traffic

>	vtkParallel.dll!vtkMPICommunicatorReduceData(const void * sendBuffer=0x000000000012c318, void * recvBuffer=0x000000000012c378, __int64 length=3, int type=11, int operation=1476395010, int destProcessId=0, int * comm=0x0000000005d77670)  Line 317	C++
 	vtkParallel.dll!vtkMPICommunicator::ReduceVoidArray(const void * sendBuffer=0x000000000012c318, void * recvBuffer=0x000000000012c378, __int64 length=3, int type=11, int operation=1, int destProcessId=0)  Line 1422 + 0x4c bytes	C++
 	vtkParallel.dll!vtkCommunicator::Reduce(const double * sendBuffer=0x000000000012c318, double * recvBuffer=0x000000000012c378, __int64 length=3, int operation=1, int destProcessId=0)  Line 633	C++
 	vtkParallel.dll!vtkMultiProcessController::Reduce(const double * sendBuffer=0x000000000012c318, double * recvBuffer=0x000000000012c378, __int64 length=3, int operation=1, int destProcessId=0)  Line 811	C++
 	vtkPVClientServerCore.dll!vtkPVSynchronizedRenderWindows::SynchronizeBounds(double * bounds=0x000000000d18a8a8)  Line 1381	C++
 	vtkPVClientServerCore.dll!vtkPVRenderView::GatherBoundsInformation(bool using_distributed_rendering=true)  Line 598	C++
 	vtkPVClientServerCore.dll!vtkPVRenderView::Render(bool interactive=false, bool skip_rendering=false)  Line 882	C++
 	vtkPVClientServerCore.dll!vtkPVRenderView::StillRender()  Line 745	C++
 	vtkPVClientServerCoreCS.dll!vtkPVRenderViewCommand(vtkClientServerInterpreter * arlu=0x0000000005d6be10, vtkObjectBase * ob=0x000000000d18a770, const char * method=0x000000000e1f7ee9, const vtkClientServerStream & msg={...}, vtkClientServerStream & resultStream={...})  Line 258	C++
 	vtkClientServer.dll!vtkClientServerInterpreter::ProcessCommandInvoke(const vtkClientServerStream & css={...}, int midx=0)  Line 379 + 0x2f bytes	C++
 	vtkClientServer.dll!vtkClientServerInterpreter::ProcessOneMessage(const vtkClientServerStream & css={...}, int message=0)  Line 214 + 0x1d bytes	C++
 	vtkClientServer.dll!vtkClientServerInterpreter::ProcessStream(const vtkClientServerStream & css={...})  Line 183 + 0x14 bytes	C++
 	vtkPVServerImplementation.dll!vtkPVSessionCore::ExecuteStreamInternal(const vtkClientServerStream & stream={...}, bool ignore_errors=false)  Line 636	C++
 	vtkPVServerImplementation.dll!vtkPVSessionCore::ExecuteStream(unsigned int location=21, const vtkClientServerStream & stream={...}, bool ignore_errors=false)  Line 606	C++
 	vtkPVServerImplementation.dll!vtkPVSessionBase::ExecuteStream(unsigned int location=21, const vtkClientServerStream & stream={...}, bool ignore_errors=false)  Line 157	C++
 	vtkPVServerManager.dll!vtkSMProxy::ExecuteStream(const vtkClientServerStream & stream={...}, bool ignore_errors=false, unsigned int location=21)  Line 2092	C++
 	vtkPVServerManager.dll!vtkSMViewProxy::StillRender()  Line 137 + 0x18 bytes	C++
 	vtkPVServerManager.dll!`anonymous namespace'::vtkRenderHelper::EventuallyRender()  Line 86	C++
 	vtkPVVTKExtensions.dll!vtkPVGenericRenderWindowInteractor::Render()  Line 302	C++
 	vtkRendering.dll!vtkRenderWindowInteractor::Initialize()  Line 632	C++
 	vtkRendering.dll!vtkRenderWindowInteractor::ReInitialize()  Line 76 + 0x13 bytes	C++
 	vtkRendering.dll!vtkWin32OpenGLRenderWindow::SetOffScreenRendering(int offscreen=0)  Line 1268	C++
 	vtkPVServerManager.dll!vtkSMRenderViewProxy::CaptureWindowInternal(int magnification=1)  Line 875	C++
 	vtkPVServerManager.dll!vtkSMViewProxy::CaptureWindow(int magnification=1)  Line 268 + 0x20 bytes	C++
 	vtkPVServerManager.dll!vtkSMViewProxy::WriteImage(const char * filename=0x000000000b619f50, const char * writerName=0x000000000ac750e0, int magnification=1)  Line 307 + 0x11 bytes	C++
 	vtkPVServerManagerPythonD.dll!PyvtkSMViewProxy_WriteImage(_object * self=0x000000000b62f6d8, _object * args=0x000000000b62b438)  Line 367 + 0x1f bytes	C++

------------------------------
but the other N-1 processes end up in here - waiting

>	vtkParallel.dll!vtkMPICommunicator::BroadcastVoidArray(void * data=0x000000000012dd24, __int64 length=1, int type=6, int root=0)  Line 1159 + 0x31 bytes	C++
 	vtkParallel.dll!vtkCommunicator::Broadcast(int * data=0x000000000012dd24, __int64 length=1, int srcProcessId=0)  Line 256	C++
 	vtkParallel.dll!vtkMultiProcessController::Broadcast(int * data=0x000000000012dd24, __int64 length=1, int srcProcessId=0)  Line 402	C++
 	vtkPVServerManager.dll!vtkSMUtilities::SaveImageOnProcessZero(vtkImageData * image=0x000000000e2c79c0, const char * filename=0x000000000b729f50, const char * writerName=0x000000000ac850e0)  Line 139	C++
 	vtkPVServerManager.dll!vtkSMViewProxy::WriteImage(const char * filename=0x000000000b729f50, const char * writerName=0x000000000ac850e0, int magnification=1)  Line 311 + 0x1f bytes	C++
 	vtkPVServerManagerPythonD.dll!PyvtkSMViewProxy_WriteImage(_object * self=0x000000000b73f6d8, _object * args=0x000000000b73b438)  Line 367 + 0x1f bytes	C++

There was a problem with the SaveImageOnProcess Zero which caused exactly this some time ago. I'm using a branch of mine derived from the v3.12.0 tag, but I cherry picked Andy's patch from kitware/master or wherever that was mentioned a few days ago -are there othe fixes on master/next that I might beneeding?

Any ideas. The pipeline is a contour of some image data on N processes. Pretty Simple.

Any help appreciated.

thanks

JB